Crankshaft seal



Dec. 8, I B WIL CRANKSHAFT SEAL Filed Oct. 5, 1927 I N VEN TOR.

ATTORNEY.

Patented Dec. 8, 1931 Animal" 3. or. 151 m, MICHIGAN, ASSIGNOR r0coiwrnranrnnmo'r'oas coa- PATE T: orF cE romrrxoiwor DETROIT, MIc rIAn'A CORPORATION or VIRGINIAL mi im se S AL ril gl ioa fiaawas;5, -1927.seriai wogazaiea sulting in their relative displacement and con-'sequent leakage at the joints of'the ring seg ments.

One object of my invention is to provide a construction particularlyadapted to prevent rotation of a split'sealing ring which bears on therear end of the crankshaft where the latter passes through thecrankcase. vMy 1nvention further resides in the provision of acrankshaft seal which may be manufactured cheaply and easily. Severalsealing devices have been suggested heretofore but I have found suchprior constructions to be ,more mostly and less eflicient than myinvention.

With a further view toward simplifying and cheapening the cost ofmanufacture I have provided a sealing ring groove provided with one ormore serrations so arranged as to permit convenient and relatively cheapdie casting. 7

With the above and other objects in View my invention further resides inthe novel arrangement and combination of parts more particularlyhereinafter described and claimed. f

In the drawings in which like reference characters indicatecorresponding parts,

Fig. 1 is a detail sectional view of the rear portion of an enginecrankshaft and crankcase showing my improved crankshaft sealmg means,

Fig. 2 is a section'view through the sealing ring and crankshaft,

t Fig. 3 is a detail view transversely through the sealing. ring showinga modified embodi-' ment of my invention and Fig. 4 is a fragmentaryview of the crankcase sealing ring groove shown in Fig. 3.

Referring to the drawings reference char- .ber 12 and 13, such asperpendicularly with 5 1 since the serrations .of eachmember 12 and132111 point in a commondirection the core may be readily pulledpermitting the die 'cter .A represent .the engine crankshaft,

which, according to present prevailing practice, may be rotatably'supported in-rear hearing 9, the rear crankshaft portion 10 extendingthrough. an opening 11 formed by the 1% lower member or rear bearingfiller b1ock'12 and the .upper member or crankcase portion 13 It willbereadily understood that the crankcase members 12 and 13 are'relatively removable in order to permit ass'emblyon the crankshaftendgwhich usually terminates in flange 14 forthe flywheel 15.' It iscustomary toprovide'a small amount of clearance" betweenthe crankshaft10. and thesurrounding crankcase members 12 and 13, such clearancebeingsealed by'a sealingri'ng 16 likewise diametricall split-at 17. -Thering 16 may --be formed of; cork or other yielding material having thedesired sealing andwearing characteristicsqandis"positioned'in'theannular; groove '13 formed in the crankcase members 12 and13'gThisannulang'roove preferably has a bottom wall 18*and' side walls-19; x

The ring-16 has'a tendency to rotate in the f groove B due to itscontact with the crank-(3.",

shaft 10, which rotationtends to crowd'the ring sectionsat-one ofth'ejoints 17 leaving thefdiametrically opposite ring ends spaced,

, resulting in leakage of crankcase oil past the crankshaft. ,Inordertopreventrotation oft. the sealingring sections I have. provided aplurality. of annula'rly spaced serrations 20 a. or other portionsextending inwardly of the groove. Theseserrations may be extendedfrom/the bottom wall 181of-the.groovecBand g 1 are preferably pointedso-a'sito bite into the sealing ring sections 16. Byarranging theseserrations so'that they extend in aflcommon d rection for eachrespective crankcase memcastingioperation. l regard-xthis feature of wmy, inventionv as contributing considerably towardv the relatively; low;cost; of manufac- 9 turing my sealing device although if desired theserrations 20 may be struck up after casting or otherwise forming thecrankcase elements l2 and 13 so as to extend in any desired direction.

In assembling the device the sealing ring segments. 16 may be pressedwithin the groove B, the serrations 20 biting into the sealing ring soas to prevent displacement of the sealing ring relative" to the housinggroove B.

Instead of forming the serrations in the bottom wall 18 such serrations20 may be formed in either or both of the side Walls 19 of groove B suchas shown in Figs. 3 and 4.

In thesefigures the serrations 20 preferably terminateshort of theopening 11 whereby in assembly, the sealing ring segments 16-may beconveniently guided into the groove before encountering the serrations.Further more as shown in 'Fig. 3 the serrations 20 are preferablystaggered alongthe opposed side walls 19.

What I claim as my invention is:

1. A device of the character described comprising in combination, arotatable shaft, cooperating relatively fixed members surroundingtheshaft and formed with an opening receivingone end of the shaft, saidmembers being formed with an annular groove concentric with'the shaftand opening toward the shaft, said groove being provided with aplurality of serrations formed in a wall of the groove, and an annularyielding segmental sealing ring within the annular groove sealing theshaft against escape of fluid, the serrations biting into the annularsealing ring to prevent rotation ofthe, sealing ring and relativedisplacement of the segments thereof, said serrations of one of saidmembers being parallel.

2. A device of the characterdescribed comprising a casing structureformed with an opening receiving a shaft portion, said casing-h'aving an-annular groove opening into said opening, said grooveprovidedwithparallelserrations'formed integrally with a wall of the groove, anda'yielding segmental sealing ring within the groove, said serrationsengaging -the sealing ring preventing rotat1on thereof and relativedisplacement of the "ll'ng segments.

3. A device of the character described comprising a casing structureformed with an opening receiving a shaft portion, said casing having anannular groove opening into said opening, said groove provided withparallel serrations, and a yielding segmental sealing ring within thegroove, said serrations engaging the sealing ring preventing rotationthereof and relative displacement of the ring segments.

4. Adeviceof the character described comprising a casing structureformed with an opening receiving a shaft portion, said casresale?tacting with the shaft, said groove provided with .parallel serrationsextending from the bottom of the groove inwardly toward the shaft to apoint-short of the shaft, said serrations engaging the sealing ringpreventing rotation thereof and relative displacement of the ringsegments at the meeting edges thereof.

In witness whereof, I hereunto subscribe my name this 29th day ofSeptember, A. D.

ALBERT B. WILLI.

